From 48f3bd2c3fc05cb42419c952bafe874f4b68d3bd Mon Sep 17 00:00:00 2001
From: Joshua Ramon Enslin <joshua@museum-digital.de>
Date: Sun, 27 Sep 2020 12:36:34 +0200
Subject: [PATCH] Allow splitting international dates (2020-12-20)

---
 src/NodaTimeSplitter.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/NodaTimeSplitter.php b/src/NodaTimeSplitter.php
index a3fb05e..76c2f33 100644
--- a/src/NodaTimeSplitter.php
+++ b/src/NodaTimeSplitter.php
@@ -523,6 +523,15 @@ final class NodaTimeSplitter {
             $day   = "0" . substr($datum, 0, 1);
             return [$start, $start, $month, $day, "+", ""];
         }
+
+        // Intl': 2020-12-20
+        if (preg_match("/^[0-9][0-9][0-9][0-9]\-[0-9][0-9]\-[0-9][0-9]$/", $datum)) { // German Y-m
+            $start = substr($datum, 0, 4);
+            $month = substr($datum, 5, 2);
+            $day   = substr($datum, 8, 2);
+            return [$start, $start, $month, $day, "+", ""];
+        }
+        // German MM.JJJJ
         if (preg_match("/^[0-9][0-9]\.[0-9][0-9][0-9][0-9]$/", $datum)) { // German Y-m
             $start = substr($datum, 3, 4);
             $month = substr($datum, 0, 2);
@@ -543,6 +552,8 @@ final class NodaTimeSplitter {
             $endDigits = substr($datum, 5, 2);
             if (intval($endDigits) > 12) return [$start, substr($datum, 0, 2) . $endDigits, "00", "00", "+", ""];
         }
+
+        // 01.01.1920-31.12.1930
         if (preg_match("/^01\.01\.[0-9][0-9][0-9][0-9]\-31\.12\.[0-9][0-9][0-9][0-9]$/", $datum)) { // Hungarian Y-m
             $start = substr($datum, 6, 4);
             $end = substr($datum, -4);